Select a unique target from a semantic snapshot

Intermediate45 min

Implement select_target(nodes, role, name, scope, observed_revision, current_revision). Return a unique actionable node ID, return None for no match, and raise ValueError for ambiguity or stale observations.

Your task

Match role, name, and scope exactly; consider only visible and enabled nodes.
Reject stale revisions before selecting a target.
Raise ValueError if more than one actionable target matches.
Return None for zero matches and leave node dictionaries unchanged.

Examples

EXAMPLE 1

InputOne visible, enabled Save button in invoice scope at revision 4; current revision 4

Output'x'

Identity, scope, actionability, and freshness all match.

def select_target(nodes, role, name, scope, observed_revision, current_revision):
    raise NotImplementedError